That depends. Water? Probably not. Most of the water goes toward Ag. Electrical? Probably, especially as we add more electric transportation options. Sewer and trash, yes.

That said, as others have mentioned, urban living arrangements can be more efficient. There is a big question though if that is compatible with the historical CA dream ideal. Sure, that ideal is becoming more and more incompatible with reality, but people want what they want. CA could offer me a free condo in a high-rise urban environment and I'd still leave because that's not something I would ever want to live in.